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I rememeber faching this issue when there is no IP interface in UP/UP state. Try configuring a loopback interface with some address and then try "router ospf". Else try bringing the frame-relay intf up and then try "router ospf"

I've thought that maybe it's related to the physical interface or the fact that I'm using a point-to-point interface.

So I physically removed and reseated the serial interface. I've also tried using another physical interface and finally I've tried setting up frame relay over just the physical interface without point-to-point or multipoint and I still can't get into router config mode. I tested it with the other protocols and it works.